1 files changed, 29 insertions, 20 deletions
diff --git a/cgi-bin/guest_book.cgi b/cgi-bin/guest_book.cgi
index d527d2d..f8caccf 100755
--- a/cgi-bin/guest_book.cgi
+++ b/cgi-bin/guest_book.cgi
@@ -62,7 +62,9 @@
         (guest `(("name" . ,name)
                  ("url" . ,url)
                  ("message" . ,message)
-                 ("date" . ,(date->string (current-date) "~B, ~d ~Y")))))
+                 ("date" . ,(date->string (current-date) "~B, ~d ~Y"))))
+        (not-already-added #t))
+    
     (if (file-exists? guest-book-json-file)
         (call-with-input-file guest-book-json-file
           (lambda (fp)
@@ -76,28 +78,35 @@
     (letrec ((check-if-already-added
               (lambda (guests)
                 (unless (eq? guests '())
-                  (unless (letrec ((guest-item-compare
-                                    (lambda (index)
-                                      (if (< index (- (length guest) 1))
-                                          (and (cdr (list-ref (car guests)
-                                                              index))
-                                               (cdr (list-ref guest index))
-                                               (guest-item-compare
-                                                (+ index 1))) ;; Unholyness
-                                           
-                  (check-if-already-added (cdr guests))))))
+                  (cond ((compare-guests 0 (car guests) guest)
+                         (set! not-already-added #f))
+                        (else
+                         (check-if-already-added (cdr guests)))))))
+             (compare-guests
+              (lambda (index guest1 guest2)
+                (and (string= (cdr (list-ref guest1 index))
+                              (cdr (list-ref guest2 index)))
+                     (cond ((< index 3)
+                            (compare-guests (+ index 1) guest1 guest2))
+                           (else #t))))))
       (check-if-already-added guest-book))
 
     ;; Add guest to guest-book
-    (cond ((eq? guest-book '())
-           (set! guest-book (list guest)))
-          (else
-           (append! guest-book (list guest))))
-
-    ;; Write guest book to json
-    (call-with-output-file guest-book-json-file
-      (lambda (fp)
-        (scm->json (list->vector guest-book) fp)))))
+    (cond (not-already-added
+           (cond ((eq? guest-book '())
+                  (set! guest-book (list guest)))
+                 (else
+                  (append! guest-book (list guest))))
+
+           ;; Write guest book to json
+           (call-with-output-file guest-book-json-file
+             (lambda (fp)
+               (scm->json (list->vector guest-book) fp)))
+
+           (display "<p>You been added to the guest book yippe (:</p>\
+<img src=\"../images/yippee.gif\" alt=\"yippee!\"/>\n"))
+           (else
+            (display "You already been added\n")))))
 
 (define (handle-fields)
   (let ((form (get-form)))